<?php
/**
   * Spyc -- A Simple PHP YAML Class
   * @version 0.5.1
   * @author Vlad Andersen <vlad.andersen@gmail.com>
   * @author Chris Wanstrath <chris@ozmm.org>
   * @link https://github.com/mustangostang/spyc/
   * @copyright Copyright 2005-2006 Chris Wanstrath, 2006-2011 Vlad Andersen
   * @license http://www.opensource.org/licenses/mit-license.php MIT License
   * @package Spyc
   */
if (!function_exists('spyc_load')) {

	/**
	 * Parses YAML to array.
	 * 
	 * @param string $string
	 *        	YAML string.
	 * @return array
	 */
	function spyc_load($string) {
		return Spyc::YAMLLoadString($string);
	}
}
if (!function_exists('spyc_load_file')) {

	/**
	 * Parses YAML to array.
	 * 
	 * @param string $file
	 *        	Path to YAML file.
	 * @return array
	 */
	function spyc_load_file($file) {
		return Spyc::YAMLLoad($file);
	}
}
if (!function_exists('spyc_dump')) {

	/**
	 * Dumps array to YAML.
	 * 
	 * @param array $data
	 *        	Array.
	 * @return string
	 */
	function spyc_dump($data) {
		return Spyc::YAMLDump($data, false, false, true);
	}
}
/**
 * The Simple PHP YAML Class.
 *
 * This class can be used to read a YAML file and convert its contents
 * into a PHP array. It currently supports a very limited subsection of
 * the YAML spec.
 *
 * Usage:
 * <code>
 * $Spyc = new Spyc;
 * $array = $Spyc->load($file);
 * </code>
 * or:
 * <code>
 * $array = Spyc::YAMLLoad($file);
 * </code>
 * or:
 * <code>
 * $array = spyc_load_file($file);
 * </code>
 * 
 * @package Spyc
 */
class Spyc {
	// SETTINGS
	const REMPTY = "\0\0\0\0\0";

	/**
	 * Setting this to true will force YAMLDump to enclose any string value in
	 * quotes.
	 * False by default.
	 *
	 * @var bool
	 */
	public $setting_dump_force_quotes = false;

	/**
	 * Setting this to true will forse YAMLLoad to use syck_load function when
	 * possible.
	 * False by default.
	 * 
	 * @var bool
	 */
	public $setting_use_syck_is_possible = false;

	/**
	 * #@+
	 * 
	 * @access private
	 * @var mixed
	 */
	private $_dumpIndent;

	private $_dumpWordWrap;

	private $_containsGroupAnchor = false;

	private $_containsGroupAlias = false;

	private $path;

	private $result;

	private $LiteralPlaceHolder = '___YAML_Literal_Block___';

	private $SavedGroups = array();

	private $indent;

	/**
	 * Path modifier that should be applied after adding current element.
	 * 
	 * @var array
	 */
	private $delayedPath = array();

	/**
	 * #@+
	 * 
	 * @access public
	 * @var mixed
	 */
	public $_nodeId;

	/**
	 * Load a valid YAML string to Spyc.
	 * 
	 * @param string $input        	
	 * @return array
	 */
	public function load($input) {
		return $this->__loadString($input);
	}

	/**
	 * Load a valid YAML file to Spyc.
	 * 
	 * @param string $file        	
	 * @return array
	 */
	public function loadFile($file) {
		return $this->__load($file);
	}

	/**
	 * Load YAML into a PHP array statically
	 *
	 * The load method, when supplied with a YAML stream (string or file),
	 * will do its best to convert YAML in a file into a PHP array. Pretty
	 * simple.
	 * Usage:
	 * <code>
	 * $array = Spyc::YAMLLoad('lucky.yaml');
	 * print_r($array);
	 * </code>
	 * 
	 * @access public
	 * @return array
	 * @param string $input
	 *        	Path of YAML file or string containing YAML
	 */
	public static function YAMLLoad($input) {
		$Spyc = new Spyc();
		return $Spyc->__load($input);
	}

	/**
	 * Load a string of YAML into a PHP array statically
	 *
	 * The load method, when supplied with a YAML string, will do its best
	 * to convert YAML in a string into a PHP array. Pretty simple.
	 *
	 * Note: use this function if you don't want files from the file system
	 * loaded and processed as YAML. This is of interest to people concerned
	 * about security whose input is from a string.
	 *
	 * Usage:
	 * <code>
	 * $array = Spyc::YAMLLoadString("---\n0: hello world\n");
	 * print_r($array);
	 * </code>
	 * 
	 * @access public
	 * @return array
	 * @param string $input
	 *        	String containing YAML
	 */
	public static function YAMLLoadString($input) {
		$Spyc = new Spyc();
		return $Spyc->__loadString($input);
	}

	/**
	 * Dump YAML from PHP array statically
	 *
	 * The dump method, when supplied with an array, will do its best
	 * to convert the array into friendly YAML. Pretty simple. Feel free to
	 * save the returned string as nothing.yaml and pass it around.
	 *
	 * Oh, and you can decide how big the indent is and what the wordwrap
	 * for folding is. Pretty cool -- just pass in 'false' for either if
	 * you want to use the default.
	 *
	 * Indent's default is 2 spaces, wordwrap's default is 40 characters. And
	 * you can turn off wordwrap by passing in 0.
	 *
	 * @access public
	 * @return string
	 * @param array $array
	 *        	PHP array
	 * @param int $indent
	 *        	Pass in false to use the default, which is 2
	 * @param int $wordwrap
	 *        	Pass in 0 for no wordwrap, false for default (40)
	 * @param int $no_opening_dashes
	 *        	Do not start YAML file with "---\n"
	 */
	public static function YAMLDump($array, $indent = false, $wordwrap = false, $no_opening_dashes = false) {
		$spyc = new Spyc();
		return $spyc->dump($array, $indent, $wordwrap, $no_opening_dashes);
	}

	/**
	 * Dump PHP array to YAML
	 *
	 * The dump method, when supplied with an array, will do its best
	 * to convert the array into friendly YAML. Pretty simple. Feel free to
	 * save the returned string as tasteful.yaml and pass it around.
	 *
	 * Oh, and you can decide how big the indent is and what the wordwrap
	 * for folding is. Pretty cool -- just pass in 'false' for either if
	 * you want to use the default.
	 *
	 * Indent's default is 2 spaces, wordwrap's default is 40 characters. And
	 * you can turn off wordwrap by passing in 0.
	 *
	 * @access public
	 * @return string
	 * @param array $array
	 *        	PHP array
	 * @param int $indent
	 *        	Pass in false to use the default, which is 2
	 * @param int $wordwrap
	 *        	Pass in 0 for no wordwrap, false for default (40)
	 */
	public function dump($array, $indent = false, $wordwrap = false, $no_opening_dashes = false) {
		// Dumps to some very clean YAML. We'll have to add some more features
		// and options soon. And better support for folding.
		// New features and options.
		if ($indent === false or !is_numeric($indent)) {
			$this->_dumpIndent = 2;
		} else {
			$this->_dumpIndent = $indent;
		}
		if ($wordwrap === false or !is_numeric($wordwrap)) {
			$this->_dumpWordWrap = 40;
		} else {
			$this->_dumpWordWrap = $wordwrap;
		}
		// New YAML document
		$string = "";
		if (!$no_opening_dashes)
			$string = "---\n";
			// Start at the base of the array and move through it.
		if ($array) {
			$array = (array)$array;
			$previous_key = -1;
			foreach ($array as $key => $value) {
				if (!isset($first_key))
					$first_key = $key;
				$string .= $this->_yamlize($key, $value, 0, $previous_key, $first_key, $array);
				$previous_key = $key;
			}
		}
		return $string;
	}

	/**
	 * Attempts to convert a key / value array item to YAML
	 * 
	 * @access private
	 * @return string
	 * @param $key The
	 *        	name of the key
	 * @param $value The
	 *        	value of the item
	 * @param $indent The
	 *        	indent of the current node
	 */
	private function _yamlize($key, $value, $indent, $previous_key = -1, $first_key = 0, $source_array = null) {
		if (is_array($value)) {
			if (empty($value))
				return $this->_dumpNode($key, array(), $indent, $previous_key, $first_key, $source_array);
				// It has children. What to do?
				// Make it the right kind of item
			$string = $this->_dumpNode($key, self::REMPTY, $indent, $previous_key, $first_key, $source_array);
			// Add the indent
			$indent += $this->_dumpIndent;
			// Yamlize the array
			$string .= $this->_yamlizeArray($value, $indent);
		} elseif (!is_array($value)) {
			// It doesn't have children. Yip.
			$string = $this->_dumpNode($key, $value, $indent, $previous_key, $first_key, $source_array);
		}
		return $string;
	}

	/**
	 * Attempts to convert an array to YAML
	 * 
	 * @access private
	 * @return string
	 * @param $array The
	 *        	array you want to convert
	 * @param $indent The
	 *        	indent of the current level
	 */
	private function _yamlizeArray($array, $indent) {
		if (is_array($array)) {
			$string = '';
			$previous_key = -1;
			foreach ($array as $key => $value) {
				if (!isset($first_key))
					$first_key = $key;
				$string .= $this->_yamlize($key, $value, $indent, $previous_key, $first_key, $array);
				$previous_key = $key;
			}
			return $string;
		} else {
			return false;
		}
	}

	/**
	 * Returns YAML from a key and a value
	 * 
	 * @access private
	 * @return string
	 * @param $key The
	 *        	name of the key
	 * @param $value The
	 *        	value of the item
	 * @param $indent The
	 *        	indent of the current node
	 */
	private function _dumpNode($key, $value, $indent, $previous_key = -1, $first_key = 0, $source_array = null) {
		// do some folding here, for blocks
		if (is_string($value) && ((strpos($value, "\n") !== false || strpos($value, ": ") !== false || strpos($value, "- ") !== false || strpos($value, "*") !== false || strpos($value, "#") !== false || strpos($value, "<") !== false || strpos($value, ">") !== false || strpos($value, '  ') !== false || strpos($value, "[") !== false || strpos($value, "]") !== false || strpos($value, "{") !== false || strpos($value, "}") !== false) || strpos($value, "&") !== false || strpos($value, "'") !== false || strpos($value, "!") === 0 || substr($value, -1, 1) == ':')) {
			$value = $this->_doLiteralBlock($value, $indent);
		} else {
			$value = $this->_doFolding($value, $indent);
		}
		if ($value === array())
			$value = '[ ]';
		if ($value === "")
			$value = '""';
		if (self::isTranslationWord($value)) {
			$value = $this->_doLiteralBlock($value, $indent);
		}
		if (trim($value) != $value)
			$value = $this->_doLiteralBlock($value, $indent);
		if (is_bool($value)) {
			$value = $value ? "true" : "false";
		}
		if ($value === null)
			$value = 'null';
		if ($value === "'" . self::REMPTY . "'")
			$value = null;
		$spaces = str_repeat(' ', $indent);
		// if (is_int($key) && $key - 1 == $previous_key && $first_key===0) {
		if (is_array($source_array) && array_keys($source_array) === range(0, count($source_array) - 1)) {
			// It's a sequence
			$string = $spaces . '- ' . $value . "\n";
		} else {
			// if ($first_key===0) throw new Exception('Keys are all screwy. The first one was zero, now it\'s "'. $key .'"');
			// It's mapped
			if (strpos($key, ":") !== false || strpos($key, "#") !== false) {
				$key = '"' . $key . '"';
			}
			$string = rtrim($spaces . $key . ': ' . $value) . "\n";
		}
		return $string;
	}

	/**
	 * Creates a literal block for dumping
	 * 
	 * @access private
	 * @return string
	 * @param
	 *        	$value
	 * @param $indent int
	 *        	The value of the indent
	 */
	private function _doLiteralBlock($value, $indent) {
		if ($value === "\n")
			return '\n';
		if (strpos($value, "\n") === false && strpos($value, "'") === false) {
			return sprintf("'%s'", $value);
		}
		if (strpos($value, "\n") === false && strpos($value, '"') === false) {
			return sprintf('"%s"', $value);
		}
		$exploded = explode("\n", $value);
		$newValue = '|';
		$indent += $this->_dumpIndent;
		$spaces = str_repeat(' ', $indent);
		foreach ($exploded as $line) {
			$newValue .= "\n" . $spaces . ($line);
		}
		return $newValue;
	}

	/**
	 * Folds a string of text, if necessary
	 * 
	 * @access private
	 * @return string
	 * @param $value The
	 *        	string you wish to fold
	 */
	private function _doFolding($value, $indent) {
		// Don't do anything if wordwrap is set to 0
		if ($this->_dumpWordWrap !== 0 && is_string($value) && strlen($value) > $this->_dumpWordWrap) {
			$indent += $this->_dumpIndent;
			$indent = str_repeat(' ', $indent);
			$wrapped = wordwrap($value, $this->_dumpWordWrap, "\n$indent");
			$value = ">\n" . $indent . $wrapped;
		} else {
			if ($this->setting_dump_force_quotes && is_string($value) && $value !== self::REMPTY)
				$value = '"' . $value . '"';
			if (is_numeric($value) && is_string($value))
				$value = '"' . $value . '"';
		}
		return $value;
	}

	private function isTrueWord($value) {
		$words = self::getTranslations(array('true', 'on', 'yes', 'y'));
		return in_array($value, $words, true);
	}

	private function isFalseWord($value) {
		$words = self::getTranslations(array('false', 'off', 'no', 'n'));
		return in_array($value, $words, true);
	}

	private function isNullWord($value) {
		$words = self::getTranslations(array('null', '~'));
		return in_array($value, $words, true);
	}

	private function isTranslationWord($value) {
		return (self::isTrueWord($value) || self::isFalseWord($value) || self::isNullWord($value));
	}

	/**
	 * Coerce a string into a native type
	 * Reference: http://yaml.org/type/bool.html
	 * TODO: Use only words from the YAML spec.
	 * 
	 * @access private
	 * @param $value The
	 *        	value to coerce
	 */
	private function coerceValue(&$value) {
		if (self::isTrueWord($value)) {
			$value = true;
		} else if (self::isFalseWord($value)) {
			$value = false;
		} else if (self::isNullWord($value)) {
			$value = null;
		}
	}

	/**
	 * Given a set of words, perform the appropriate translations on them to
	 * match the YAML 1.1 specification for type coercing.
	 * 
	 * @param $words The
	 *        	words to translate
	 * @access private
	 */
	private static function getTranslations(array $words) {
		$result = array();
		foreach ($words as $i) {
			$result = array_merge($result, array(ucfirst($i), strtoupper($i), strtolower($i)));
		}
		return $result;
	}
	// LOADING FUNCTIONS
	private function __load($input) {
		$Source = $this->loadFromSource($input);
		return $this->loadWithSource($Source);
	}

	private function __loadString($input) {
		$Source = $this->loadFromString($input);
		return $this->loadWithSource($Source);
	}

	private function loadWithSource($Source) {
		if (empty($Source))
			return array();
		$this->path = array();
		$this->result = array();
		$cnt = count($Source);
		for($i = 0; $i < $cnt; $i++) {
			$line = $Source[$i];
			$this->indent = strlen($line) - strlen(ltrim($line));
			$tempPath = $this->getParentPathByIndent($this->indent);
			$line = self::stripIndent($line, $this->indent);
			if (self::isComment($line))
				continue;
			if (self::isEmpty($line))
				continue;
			$this->path = $tempPath;
			$literalBlockStyle = self::startsLiteralBlock($line);
			if ($literalBlockStyle) {
				$line = rtrim($line, $literalBlockStyle . " \n");
				$literalBlock = '';
				$line .= ' ' . $this->LiteralPlaceHolder;
				$literal_block_indent = strlen($Source[$i + 1]) - strlen(ltrim($Source[$i + 1]));
				while (++$i < $cnt && $this->literalBlockContinues($Source[$i], $this->indent)) {
					$literalBlock = $this->addLiteralLine($literalBlock, $Source[$i], $literalBlockStyle, $literal_block_indent);
				}
				$i--;
			}
			// Strip out comments
			if (strpos($line, '#')) {
				$line = preg_replace('/\s*#([^"\']+)$/', '', $line);
			}
			while (++$i < $cnt && self::greedilyNeedNextLine($line)) {
				$line = rtrim($line, " \n\t\r") . ' ' . ltrim($Source[$i], " \t");
			}
			$i--;
			$lineArray = $this->_parseLine($line);
			if ($literalBlockStyle)
				$lineArray = $this->revertLiteralPlaceHolder($lineArray, $literalBlock);
			$this->addArray($lineArray, $this->indent);
			foreach ($this->delayedPath as $indent => $delayedPath)
				$this->path[$indent] = $delayedPath;
			$this->delayedPath = array();
		}
		return $this->result;
	}

	private function loadFromSource($input) {
		if (!empty($input) && strpos($input, "\n") === false && file_exists($input))
			$input = file_get_contents($input);
		return $this->loadFromString($input);
	}

	private function loadFromString($input) {
		$lines = explode("\n", $input);
		foreach ($lines as $k => $_) {
			$lines[$k] = rtrim($_, "\r");
		}
		return $lines;
	}

	/**
	 * Parses YAML code and returns an array for a node
	 * 
	 * @access private
	 * @return array
	 * @param string $line
	 *        	A line from the YAML file
	 */
	private function _parseLine($line) {
		if (!$line)
			return array();
		$line = trim($line);
		if (!$line)
			return array();
		$array = array();
		$group = $this->nodeContainsGroup($line);
		if ($group) {
			$this->addGroup($line, $group);
			$line = $this->stripGroup($line, $group);
		}
		if ($this->startsMappedSequence($line))
			return $this->returnMappedSequence($line);
		if ($this->startsMappedValue($line))
			return $this->returnMappedValue($line);
		if ($this->isArrayElement($line))
			return $this->returnArrayElement($line);
		if ($this->isPlainArray($line))
			return $this->returnPlainArray($line);
		return $this->returnKeyValuePair($line);
	}

	/**
	 * Finds the type of the passed value, returns the value as the new type.
	 * 
	 * @access private
	 * @param string $value        	
	 * @return mixed
	 */
	private function _toType($value) {
		if ($value === '')
			return "";
		$first_character = $value[0];
		$last_character = substr($value, -1, 1);
		$is_quoted = false;
		do {
			if (!$value)
				break;
			if ($first_character != '"' && $first_character != "'")
				break;
			if ($last_character != '"' && $last_character != "'")
				break;
			$is_quoted = true;
		} while (0);
		if ($is_quoted) {
			$value = str_replace('\n', "\n", $value);
			return strtr(substr($value, 1, -1), array('\\"' => '"', '\'\'' => '\'', '\\\'' => '\''));
		}
		if (strpos($value, ' #') !== false && !$is_quoted)
			$value = preg_replace('/\s+#(.+)$/', '', $value);
		if ($first_character == '[' && $last_character == ']') {
			// Take out strings sequences and mappings
			$innerValue = trim(substr($value, 1, -1));
			if ($innerValue === '')
				return array();
			$explode = $this->_inlineEscape($innerValue);
			// Propagate value array
			$value = array();
			foreach ($explode as $v) {
				$value[] = $this->_toType($v);
			}
			return $value;
		}
		if (strpos($value, ': ') !== false && $first_character != '{') {
			$array = explode(': ', $value);
			$key = trim($array[0]);
			array_shift($array);
			$value = trim(implode(': ', $array));
			$value = $this->_toType($value);
			return array($key => $value);
		}
		if ($first_character == '{' && $last_character == '}') {
			$innerValue = trim(substr($value, 1, -1));
			if ($innerValue === '')
				return array();
				// Inline Mapping
				// Take out strings sequences and mappings
			$explode = $this->_inlineEscape($innerValue);
			// Propagate value array
			$array = array();
			foreach ($explode as $v) {
				$SubArr = $this->_toType($v);
				if (empty($SubArr))
					continue;
				if (is_array($SubArr)) {
					$array[key($SubArr)] = $SubArr[key($SubArr)];
					continue;
				}
				$array[] = $SubArr;
			}
			return $array;
		}
		if ($value == 'null' || $value == 'NULL' || $value == 'Null' || $value == '' || $value == '~') {
			return null;
		}
		if (is_numeric($value) && preg_match('/^(-|)[1-9]+[0-9]*$/', $value)) {
			$intvalue = (int)$value;
			if ($intvalue != PHP_INT_MAX)
				$value = $intvalue;
			return $value;
		}
		if (is_numeric($value) && preg_match('/^0[xX][0-9a-fA-F]+$/', $value)) {
			// Hexadecimal value.
			return hexdec($value);
		}
		$this->coerceValue($value);
		if (is_numeric($value)) {
			if ($value === '0')
				return 0;
			if (rtrim($value, 0) === $value)
				$value = (float)$value;
			return $value;
		}
		return $value;
	}

	/**
	 * Used in inlines to check for more inlines or quoted strings
	 * 
	 * @access private
	 * @return array
	 */
	private function _inlineEscape($inline) {
		// There's gotta be a cleaner way to do this...
		// While pure sequences seem to be nesting just fine,
		// pure mappings and mappings with sequences inside can't go very
		// deep. This needs to be fixed.
		$seqs = array();
		$maps = array();
		$saved_strings = array();
		$saved_empties = array();
		// Check for empty strings
		$regex = '/("")|(\'\')/';
		if (preg_match_all($regex, $inline, $strings)) {
			$saved_empties = $strings[0];
			$inline = preg_replace($regex, 'YAMLEmpty', $inline);
		}
		unset($regex);
		// Check for strings
		$regex = '/(?:(")|(?:\'))((?(1)[^"]+|[^\']+))(?(1)"|\')/';
		if (preg_match_all($regex, $inline, $strings)) {
			$saved_strings = $strings[0];
			$inline = preg_replace($regex, 'YAMLString', $inline);
		}
		unset($regex);
		// echo $inline;
		$i = 0;
		do {
			// Check for sequences
			while (preg_match('/\[([^{}\[\]]+)\]/U', $inline, $matchseqs)) {
				$seqs[] = $matchseqs[0];
				$inline = preg_replace('/\[([^{}\[\]]+)\]/U', ('YAMLSeq' . (count($seqs) - 1) . 's'), $inline, 1);
			}
			// Check for mappings
			while (preg_match('/{([^\[\]{}]+)}/U', $inline, $matchmaps)) {
				$maps[] = $matchmaps[0];
				$inline = preg_replace('/{([^\[\]{}]+)}/U', ('YAMLMap' . (count($maps) - 1) . 's'), $inline, 1);
			}
			if ($i++ >= 10)
				break;
		} while (strpos($inline, '[') !== false || strpos($inline, '{') !== false);
		$explode = explode(',', $inline);
		$explode = array_map('trim', $explode);
		$stringi = 0;
		$i = 0;
		while (1) {
			// Re-add the sequences
			if (!empty($seqs)) {
				foreach ($explode as $key => $value) {
					if (strpos($value, 'YAMLSeq') !== false) {
						foreach ($seqs as $seqk => $seq) {
							$explode[$key] = str_replace(('YAMLSeq' . $seqk . 's'), $seq, $value);
							$value = $explode[$key];
						}
					}
				}
			}
			// Re-add the mappings
			if (!empty($maps)) {
				foreach ($explode as $key => $value) {
					if (strpos($value, 'YAMLMap') !== false) {
						foreach ($maps as $mapk => $map) {
							$explode[$key] = str_replace(('YAMLMap' . $mapk . 's'), $map, $value);
							$value = $explode[$key];
						}
					}
				}
			}
			// Re-add the strings
			if (!empty($saved_strings)) {
				foreach ($explode as $key => $value) {
					while (strpos($value, 'YAMLString') !== false) {
						$explode[$key] = preg_replace('/YAMLString/', $saved_strings[$stringi], $value, 1);
						unset($saved_strings[$stringi]);
						++$stringi;
						$value = $explode[$key];
					}
				}
			}
			// Re-add the empties
			if (!empty($saved_empties)) {
				foreach ($explode as $key => $value) {
					while (strpos($value, 'YAMLEmpty') !== false) {
						$explode[$key] = preg_replace('/YAMLEmpty/', '', $value, 1);
						$value = $explode[$key];
					}
				}
			}
			$finished = true;
			foreach ($explode as $key => $value) {
				if (strpos($value, 'YAMLSeq') !== false) {
					$finished = false;
					break;
				}
				if (strpos($value, 'YAMLMap') !== false) {
					$finished = false;
					break;
				}
				if (strpos($value, 'YAMLString') !== false) {
					$finished = false;
					break;
				}
				if (strpos($value, 'YAMLEmpty') !== false) {
					$finished = false;
					break;
				}
			}
			if ($finished)
				break;
			$i++;
			if ($i > 10)
				break; // Prevent infinite loops.
		}
		return $explode;
	}

	private function literalBlockContinues($line, $lineIndent) {
		if (!trim($line))
			return true;
		if (strlen($line) - strlen(ltrim($line)) > $lineIndent)
			return true;
		return false;
	}

	private function referenceContentsByAlias($alias) {
		do {
			if (!isset($this->SavedGroups[$alias])) {
				echo "Bad group name: $alias.";
				break;
			}
			$groupPath = $this->SavedGroups[$alias];
			$value = $this->result;
			foreach ($groupPath as $k) {
				$value = $value[$k];
			}
		} while (false);
		return $value;
	}

	private function addArrayInline($array, $indent) {
		$CommonGroupPath = $this->path;
		if (empty($array))
			return false;
		foreach ($array as $k => $_) {
			$this->addArray(array($k => $_), $indent);
			$this->path = $CommonGroupPath;
		}
		return true;
	}

	private function addArray($incoming_data, $incoming_indent) {
		// print_r ($incoming_data);
		if (count($incoming_data) > 1)
			return $this->addArrayInline($incoming_data, $incoming_indent);
		$key = key($incoming_data);
		$value = isset($incoming_data[$key]) ? $incoming_data[$key] : null;
		if ($key === '__!YAMLZero')
			$key = '0';
		if ($incoming_indent == 0 && !$this->_containsGroupAlias && !$this->_containsGroupAnchor) { // Shortcut for root-level values.
			if ($key || $key === '' || $key === '0') {
				$this->result[$key] = $value;
			} else {
				$this->result[] = $value;
				end($this->result);
				$key = key($this->result);
			}
			$this->path[$incoming_indent] = $key;
			return;
		}
		$history = array();
		// Unfolding inner array tree.
		$history[] = $_arr = $this->result;
		foreach ($this->path as $k) {
			$history[] = $_arr = $_arr[$k];
		}
		if ($this->_containsGroupAlias) {
			$value = $this->referenceContentsByAlias($this->_containsGroupAlias);
			$this->_containsGroupAlias = false;
		}
		// Adding string or numeric key to the innermost level or $this->arr.
		if (is_string($key) && $key == '<<') {
			if (!is_array($_arr)) {
				$_arr = array();
			}
			$_arr = array_merge($_arr, $value);
		} else if ($key || $key === '' || $key === '0') {
			if (!is_array($_arr))
				$_arr = array($key => $value);
			else
				$_arr[$key] = $value;
		} else {
			if (!is_array($_arr)) {
				$_arr = array($value);
				$key = 0;
			} else {
				$_arr[] = $value;
				end($_arr);
				$key = key($_arr);
			}
		}
		$reverse_path = array_reverse($this->path);
		$reverse_history = array_reverse($history);
		$reverse_history[0] = $_arr;
		$cnt = count($reverse_history) - 1;
		for($i = 0; $i < $cnt; $i++) {
			$reverse_history[$i + 1][$reverse_path[$i]] = $reverse_history[$i];
		}
		$this->result = $reverse_history[$cnt];
		$this->path[$incoming_indent] = $key;
		if ($this->_containsGroupAnchor) {
			$this->SavedGroups[$this->_containsGroupAnchor] = $this->path;
			if (is_array($value)) {
				$k = key($value);
				if (!is_int($k)) {
					$this->SavedGroups[$this->_containsGroupAnchor][$incoming_indent + 2] = $k;
				}
			}
			$this->_containsGroupAnchor = false;
		}
	}

	private static function startsLiteralBlock($line) {
		$lastChar = substr(trim($line), -1);
		if ($lastChar != '>' && $lastChar != '|')
			return false;
		if ($lastChar == '|')
			return $lastChar;
			// HTML tags should not be counted as literal blocks.
		if (preg_match('#<.*?>$#', $line))
			return false;
		return $lastChar;
	}

	private static function greedilyNeedNextLine($line) {
		$line = trim($line);
		if (!strlen($line))
			return false;
		if (substr($line, -1, 1) == ']')
			return false;
		if ($line[0] == '[')
			return true;
		if (preg_match('#^[^:]+?:\s*\[#', $line))
			return true;
		return false;
	}

	private function addLiteralLine($literalBlock, $line, $literalBlockStyle, $indent = -1) {
		$line = self::stripIndent($line, $indent);
		if ($literalBlockStyle !== '|') {
			$line = self::stripIndent($line);
		}
		$line = rtrim($line, "\r\n\t ") . "\n";
		if ($literalBlockStyle == '|') {
			return $literalBlock . $line;
		}
		if (strlen($line) == 0)
			return rtrim($literalBlock, ' ') . "\n";
		if ($line == "\n" && $literalBlockStyle == '>') {
			return rtrim($literalBlock, " \t") . "\n";
		}
		if ($line != "\n")
			$line = trim($line, "\r\n ") . " ";
		return $literalBlock . $line;
	}

	function revertLiteralPlaceHolder($lineArray, $literalBlock) {
		foreach ($lineArray as $k => $_) {
			if (is_array($_))
				$lineArray[$k] = $this->revertLiteralPlaceHolder($_, $literalBlock);
			else if (substr($_, -1 * strlen($this->LiteralPlaceHolder)) == $this->LiteralPlaceHolder)
				$lineArray[$k] = rtrim($literalBlock, " \r\n");
		}
		return $lineArray;
	}

	private static function stripIndent($line, $indent = -1) {
		if ($indent == -1)
			$indent = strlen($line) - strlen(ltrim($line));
		return substr($line, $indent);
	}

	private function getParentPathByIndent($indent) {
		if ($indent == 0)
			return array();
		$linePath = $this->path;
		do {
			end($linePath);
			$lastIndentInParentPath = key($linePath);
			if ($indent <= $lastIndentInParentPath)
				array_pop($linePath);
		} while ($indent <= $lastIndentInParentPath);
		return $linePath;
	}

	private function clearBiggerPathValues($indent) {
		if ($indent == 0)
			$this->path = array();
		if (empty($this->path))
			return true;
		foreach ($this->path as $k => $_) {
			if ($k > $indent)
				unset($this->path[$k]);
		}
		return true;
	}

	private static function isComment($line) {
		if (!$line)
			return false;
		if ($line[0] == '#')
			return true;
		if (trim($line, " \r\n\t") == '---')
			return true;
		return false;
	}

	private static function isEmpty($line) {
		return (trim($line) === '');
	}

	private function isArrayElement($line) {
		if (!$line || !is_scalar($line))
			return false;
		if (substr($line, 0, 2) != '- ')
			return false;
		if (strlen($line) > 3)
			if (substr($line, 0, 3) == '---')
				return false;
		return true;
	}

	private function isHashElement($line) {
		return strpos($line, ':');
	}

	private function isLiteral($line) {
		if ($this->isArrayElement($line))
			return false;
		if ($this->isHashElement($line))
			return false;
		return true;
	}

	private static function unquote($value) {
		if (!$value)
			return $value;
		if (!is_string($value))
			return $value;
		if ($value[0] == '\'')
			return trim($value, '\'');
		if ($value[0] == '"')
			return trim($value, '"');
		return $value;
	}

	private function startsMappedSequence($line) {
		return (substr($line, 0, 2) == '- ' && substr($line, -1, 1) == ':');
	}

	private function returnMappedSequence($line) {
		$array = array();
		$key = self::unquote(trim(substr($line, 1, -1)));
		$array[$key] = array();
		$this->delayedPath = array(strpos($line, $key) + $this->indent => $key);
		return array($array);
	}

	private function checkKeysInValue($value) {
		if (strchr('[{"\'', $value[0]) === false) {
			if (strchr($value, ': ') !== false) {
				throw new Exception('Too many keys: ' . $value);
			}
		}
	}

	private function returnMappedValue($line) {
		$this->checkKeysInValue($line);
		$array = array();
		$key = self::unquote(trim(substr($line, 0, -1)));
		$array[$key] = '';
		return $array;
	}

	private function startsMappedValue($line) {
		return (substr($line, -1, 1) == ':');
	}

	private function isPlainArray($line) {
		return ($line[0] == '[' && substr($line, -1, 1) == ']');
	}

	private function returnPlainArray($line) {
		return $this->_toType($line);
	}

	private function returnKeyValuePair($line) {
		$array = array();
		$key = '';
		if (strpos($line, ': ')) {
			// It's a key/value pair most likely
			// If the key is in double quotes pull it out
			if (($line[0] == '"' || $line[0] == "'") && preg_match('/^(["\'](.*)["\'](\s)*:)/', $line, $matches)) {
				$value = trim(str_replace($matches[1], '', $line));
				$key = $matches[2];
			} else {
				// Do some guesswork as to the key and the value
				$explode = explode(': ', $line);
				$key = trim(array_shift($explode));
				$value = trim(implode(': ', $explode));
				$this->checkKeysInValue($value);
			}
			// Set the type of the value. Int, string, etc
			$value = $this->_toType($value);
			if ($key === '0')
				$key = '__!YAMLZero';
			$array[$key] = $value;
		} else {
			$array = array($line);
		}
		return $array;
	}

	private function returnArrayElement($line) {
		if (strlen($line) <= 1)
			return array(array()); // Weird %)
		$array = array();
		$value = trim(substr($line, 1));
		$value = $this->_toType($value);
		if ($this->isArrayElement($value)) {
			$value = $this->returnArrayElement($value);
		}
		$array[] = $value;
		return $array;
	}

	private function nodeContainsGroup($line) {
		$symbolsForReference = 'A-z0-9_\-';
		if (strpos($line, '&') === false && strpos($line, '*') === false)
			return false; // Please die fast ;-)
		if ($line[0] == '&' && preg_match('/^(&[' . $symbolsForReference . ']+)/', $line, $matches))
			return $matches[1];
		if ($line[0] == '*' && preg_match('/^(\*[' . $symbolsForReference . ']+)/', $line, $matches))
			return $matches[1];
		if (preg_match('/(&[' . $symbolsForReference . ']+)$/', $line, $matches))
			return $matches[1];
		if (preg_match('/(\*[' . $symbolsForReference . ']+$)/', $line, $matches))
			return $matches[1];
		if (preg_match('#^\s*<<\s*:\s*(\*[^\s]+).*$#', $line, $matches))
			return $matches[1];
		return false;
	}

	private function addGroup($line, $group) {
		if ($group[0] == '&')
			$this->_containsGroupAnchor = substr($group, 1);
		if ($group[0] == '*')
			$this->_containsGroupAlias = substr($group, 1);
		// print_r ($this->path);
	}

	private function stripGroup($line, $group) {
		$line = trim(str_replace($group, '', $line));
		return $line;
	}
}

// Enable use of Spyc from command line
// The syntax is the following: php Spyc.php spyc.yaml
do {
	if (PHP_SAPI != 'cli')
		break;
	if (empty($_SERVER['argc']) || $_SERVER['argc'] < 2)
		break;
	if (empty($_SERVER['PHP_SELF']) || FALSE === strpos($_SERVER['PHP_SELF'], 'Spyc.php'))
		break;
	$file = $argv[1];
	echo Json::encode(spyc_load_file($file));
} while (0);